package com.xiaoxi.bms.service.common.verification.impl;

import com.xiaoxi.bms.common.constant.constant.TimeConstants;
import com.xiaoxi.bms.domain.common.ImageCode;
import com.xiaoxi.bms.service.common.verification.CodeImageService;
import org.springframework.stereotype.Service;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Base64;
import java.util.Random;

/**
 * @author xiaoxi
 * @version 1.0
 * @date 2022/5/17 15:30
 */
@Service
public class CodeImageServiceImpl implements CodeImageService {
    @Override
    public ImageCode createImageCode() throws IOException {

        int width = 65; //验证码图片长度
        int height = 25;//宽

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        Graphics g = image.getGraphics();

        Random random = new Random();

        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);
        g.setFont(new Font("Times New Roman", Font.ITALIC, 20));
        g.setColor(getRandColor(160, 200));
        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }

        StringBuilder sRand = new StringBuilder();
        for (int i = 0; i < 4; i++) {
            String rand = String.valueOf(random.nextInt(10));
            sRand.append(rand);
            g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
            g.drawString(rand, 13 * i + 6, 16);
        }

        g.dispose();

        // 生成BASE64
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ImageIO.write(image, "jpg", outputStream);
        String base64Img = Base64.getEncoder().encodeToString(outputStream.toByteArray());

        return new ImageCode("data:image/jpeg;base64," + base64Img, sRand.toString(), TimeConstants.VALIDATE_CODE);
    }

    /**
     * 生成随机背景条纹
     */
    private Color getRandColor(int fc, int bc) {
        Random random = new Random();
        if (fc > 255) {
            fc = 255;
        }
        if (bc > 255) {
            bc = 255;
        }
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }

}
